I personally could speak to a class or group about autism. My fourteen-year-old daughter, Austen, has autism. There are a lot of myths out there about what an autistic person is "like." Although 1 in 120 children are diagnosed with this neurological disorder which primarily affects social interaction, very few people have ever met with someone who has autism. If they have heard of it at all, they will ask me, "Oh, is she like "Rainman," (the film starring Dustin Hoffman as an autistic savant) or, more recently, is she like Temple Grandin?
The answer is no, she is not a savant and no, she is not as communicative as Temple, yet she is verbal and very loving, a fact that surprises a lot of people who tend to think that all autistic people do not show love.
I could also speak for a long while on the effects on the entire family of having a child with autism. The stress is unbelievable. Most marriages do not survive it (mine did not), most neurotypical siblings will need therapy (my son did).
I would try to dispell the myth that vaccines cause autism. I would try to show that even though we have our challenges, I cannot imagine my daughter as a different "normal" person.